<template>
	<div>
		<div style="margin: 10px 0">
			<el-input style="width: 200px" placeholder="请输入名称" suffix-icon="el-icon-search" v-model="name"></el-input>
			<el-button class="ml-5" type="primary" @click="load">搜索</el-button>
			<el-button type="warning" @click="reset">重置</el-button>
		</div>
		<div style="margin: 10px 0">
			<el-button type="primary" @click="handleAdd" v-if="user.role === 'ROLE_ADMIN'">新增 <i
					class="el-icon-circle-plus-outline"></i></el-button>
			<el-popconfirm class="ml-5" confirm-button-text='确定' cancel-button-text='我再想想' icon="el-icon-info"
				icon-color="red" title="您确定批量删除这些数据吗？" @confirm="delBatch">
				<el-button type="danger" slot="reference">批量删除 <i class="el-icon-remove-outline"></i></el-button>
			</el-popconfirm>

		</div>
		<el-table :data="tableData" border stripe :header-cell-class-name="'headerBg'"
			@selection-change="handleSelectionChange">
			<el-table-column type="selection" width="55"></el-table-column>
			<el-table-column prop="id" label="ID" width="80"></el-table-column>
			<el-table-column prop="name" label="课程名称"></el-table-column>
			<el-table-column prop="score" label="文件类型"></el-table-column>
			<el-table-column prop="times" label="课时"></el-table-column>
			<el-table-column prop="teacher" label="授课老师"></el-table-column>
			<el-table-column label="启用">
				<template slot-scope="scope">
					<el-switch v-model="scope.row.state" active-color="#13ce66" inactive-color="#ccc"
						@change="changeEnable(scope.row)"></el-switch>
				</template>
			</el-table-column>
			<el-table-column label="操作" width="280" align="center">
				<template slot-scope="scope">
					<el-button type="primary" @click="selectCourse(scope.row.id)">选课</el-button>
					<el-button type="success" @click="handleEdit(scope.row)" v-if="user.role === 'ROLE_ADMIN'">编辑 <i
							class="el-icon-edit"></i></el-button>
					<el-popconfirm class="ml-5" confirm-button-text='确定' cancel-button-text='我再想想' icon="el-icon-info"
						icon-color="red" title="您确定删除吗？" @confirm="del(scope.row.id)">
						<el-button type="danger" slot="reference" v-if="user.role === 'ROLE_ADMIN'">删除 <i
								class="el-icon-remove-outline"></i></el-button>
					</el-popconfirm>
				</template>
			</el-table-column>
		</el-table>

		<div style="padding: 10px 0">
			<el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="pageNum"
				:page-sizes="[2, 5, 10, 20]" :page-size="pageSize" layout="total, sizes, prev, pager, next, jumper"
				:total="total">
			</el-pagination>
		</div>

		<el-dialog title="课程信息" :visible.sync="dialogFormVisible" width="30%">
			<el-form label-width="80px" size="small">
				<el-form-item label="名称">
					<el-input v-model="form.name" autocomplete="off"></el-input>
				</el-form-item>
				<el-form-item label="学分">
					<el-input v-model="form.score" autocomplete="off"></el-input>
				</el-form-item>
				<el-form-item label="课时">
					<el-input v-model="form.times" autocomplete="off"></el-input>
				</el-form-item>
				<el-form-item label="老师">
					<el-select clearable v-model="form.teacherId" placeholder="请选择">
						<el-option v-for="item in teachers" :key="item.id" :label="item.nickname" :value="item.id">
						</el-option>
					</el-select>
				</el-form-item>
			</el-form>
			<div slot="footer" class="dialog-footer">
				<el-button @click="dialogFormVisible = false">取 消</el-button>
				<el-button type="primary" @click="save">确 定</el-button>
			</div>
		</el-dialog>

	</div>
</template>

<script>
	export default {
		name: "Course",
		data() {
			return {
				form: {},
				tableData: [],
				name: '',
				multipleSelection: [],
				pageNum: 1,
				pageSize: 10,
				total: 0,
				dialogFormVisible: false,
				teachers: [],
				user: localStorage.getItem("user") ? JSON.parse(localStorage.getItem("user")) : {}
			}
		},
		created() {
			this.load()
		},
		methods: {
			selectCourse(courseId) {
				this.request.post('/course/studentCourse/' + courseId + "/" + this.user.id).then(res => {
					if (res.code === '200') {
						this.$message.success("选课成功")
					} else {
						this.$message.success(res.msg)
					}
				})
			},
			load() {
				this.request.get("/course/page", {
					params: {
						pageNum: this.pageNum,
						pageSize: this.pageSize,
						name: this.name,
					}
				}).then(res => {

					this.tableData = res.data.records
					this.total = res.data.total

				})

				this.request.get("/user/role/ROLE_TEACHER").then(res => {
					this.teachers = res.data
				})
			},
			changeEnable(row) {
				this.request.post("/course/update", row).then(res => {
					if (res.code === '200') {
						this.$message.success("操作成功")
					}
				})
			},
			handleAdd() {
				this.dialogFormVisible = true
				this.form = {}
			},
			handleEdit(row) {
				this.form = JSON.parse(JSON.stringify(row))
				this.dialogFormVisible = true
			},
			del(id) {
				this.request.delete("/course/" + id).then(res => {
					if (res.code === '200') {
						this.$message.success("删除成功")
						this.load()
					} else {
						this.$message.error("删除失败")
					}
				})
			},
			handleSelectionChange(val) {
				console.log(val)
				this.multipleSelection = val
			},
			delBatch() {
				let ids = this.multipleSelection.map(v => v.id) // [{}, {}, {}] => [1,2,3]
				this.request.post("/course/del/batch", ids).then(res => {
					if (res.code === '200') {
						this.$message.success("批量删除成功")
						this.load()
					} else {
						this.$message.error("批量删除失败")
					}
				})
			},
			save() {
				this.request.post("/course", this.form).then(res => {
					if (res.code === '200') {
						this.$message.success("保存成功")
						this.dialogFormVisible = false
						this.load()
					} else {
						this.$message.error("保存失败")
					}
				})
			},
			reset() {
				this.name = ""
				this.load()
			},
			handleSizeChange(pageSize) {
				console.log(pageSize)
				this.pageSize = pageSize
				this.load()
			},
			handleCurrentChange(pageNum) {
				console.log(pageNum)
				this.pageNum = pageNum
				this.load()
			},
			download(url) {
				window.open(url)
			},
		}
	}
</script>

<style scoped>

</style>
